Natural properties of high speed on-off valves can be described through their on-off behavior and spool movement (static and oscillating) characteristics. High speed on-off valves can be combined with actuators in sys...Natural properties of high speed on-off valves can be described through their on-off behavior and spool movement (static and oscillating) characteristics. High speed on-off valves can be combined with actuators in systems into four typical types of composite valves whose static characteristics are related not only to the structures of the single valves and the composite ones, but also to the PWM control modes. It is proved that the composite valves have similar features as those of servo valves. The nonlinear specific properties of single valves composited can be completely compensated by the suitable PWM control modes.展开更多
The main design factors which effect on operating speed of solenoid actuator for valve operation are mass of plunger, electromagnetic motive force, inductance and return spring, and these factors are not independent b...The main design factors which effect on operating speed of solenoid actuator for valve operation are mass of plunger, electromagnetic motive force, inductance and return spring, and these factors are not independent but related with each other in view point of design and electromagnetic theory. It is impossible to increase the operating speed by only change the value of any one design factor. The change of any one value results in change of any value related it in various design factors. Permanent magnets are as assistant materials which make higher flux density in air gap. Electromagnetic motive force in controlled only by current. This paper presents a speed increasing design method of solenoid actuator using a solenoid, by some governing equations which are composed of electromagnetic theory and empirical knowledge, and proved the propriety by experiments.展开更多
文摘Natural properties of high speed on-off valves can be described through their on-off behavior and spool movement (static and oscillating) characteristics. High speed on-off valves can be combined with actuators in systems into four typical types of composite valves whose static characteristics are related not only to the structures of the single valves and the composite ones, but also to the PWM control modes. It is proved that the composite valves have similar features as those of servo valves. The nonlinear specific properties of single valves composited can be completely compensated by the suitable PWM control modes.
文摘The main design factors which effect on operating speed of solenoid actuator for valve operation are mass of plunger, electromagnetic motive force, inductance and return spring, and these factors are not independent but related with each other in view point of design and electromagnetic theory. It is impossible to increase the operating speed by only change the value of any one design factor. The change of any one value results in change of any value related it in various design factors. Permanent magnets are as assistant materials which make higher flux density in air gap. Electromagnetic motive force in controlled only by current. This paper presents a speed increasing design method of solenoid actuator using a solenoid, by some governing equations which are composed of electromagnetic theory and empirical knowledge, and proved the propriety by experiments.
